Lock



June 29 1926.

J. KONIG Lbbx Filed Dec. -19, 1922 3 Sheets-Sheet 1 J. KUNIG June 29 1926.

Loan.

Filed Dec. 19, 1922 3 Sheets-Sheet 2 June 29 1926.

J.' Kbme LOCK Filed Dec. 19, 1922 3 Sheets-Sheet 8 ZZ Vf/IZa/w Patented June 29, 1926.

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LOCK.

Application filed December 19, 1922, Serial No. 607,853, and. in Czechoslovakia December 28, 1921.

flit has already been proposed to make locks for right-hand and left-hand use. Such locks have a bolt with recesses for the key arranged symmetrically to the axis of the bolt and tumblers of symmetrical form. In all constructional forms known hitherto the tumblers are always under spring pressure, even when the lock is open, which causes the springs in time to lose resilience. The springs are arranged either so that they are capable of being moved in the lock casing for setting the tumblers so as to coact with one or the other recess on the bolt, or they are in a spring pressed or loaded middle position, which renders a special setting of the springs and tumblers before inserting the lock unnecessary, the lock being capable of being locked and opened from either of the two key holes.

One of the oldest forms of such locks is fitted with a two-armed lever for setting the double springs of thetumblers, which lever can be set from either of the two keyholes with the bolt in any position for one or the other key recess in the bolt. In this arrangement the tumble-rs are always acted up on by the force exerted by one part of the spring or the other.

All these devices provide a more or less 0 satisfactory solution for a lock for righthand and left-hand use, but they cannot be used for safety locks. This is made possible by the present invention, according to which in addition to a bolt with two key recesses and correspondingly symmetrical tumblers an auxiliary tumbler is used, which can be displaced from a middle position, in which it is not spring loaded, from either keyhole for suitably setting the tumblers, but when the bolt is in the locked position can only be swung back again on the bolt being returned into the open position by that key recess on the latter by which the closing movement of the bolt was effected. The advantage of this arrangement is that, when the keyholes are suitably arranged, the look will have the same degree of safety as certain safety locks, namely that it is impossible for instance to open the door from without, when it has been locked from within.

Thus the lock used hitherto as a right hand and left-hand lock will have a far wider field of application, since it becomes suitable for use as a safety lock.

In the accompanying drawings, the lock shown by way of example is a trunk lock.

Figs. 1, 2 and 3 are plan views with the side of the casing removed andthe bolt in clifferent positions, Fig. t shows the lock in cross-section, Figs. 5, 6 and 7 are details and Fig. 8 shows a constructional form of the tumblers used.

In the example shown a is the bolt, which is acted on by the lock mechanism, and is guided in the front plate 6 and by the pin 0 in the lock casing in the usual manner. The bolt is provided on opposite sides with driving teet-hd, d". The tumblers e are mounted in a known manner on the pin 0, so that they can rotate on the same. When the bolt is in the retracted position (Fig. 1), the force otherwise exerted by the springs f and acting on the tumblers e is suspended. In order to make this force effective for bringing the tumblers e into the operative position, the mechanism is provided with a special auxiliary tumbler g 6). The latter has a V or U shaped slot formedby the longitudinal slots h and h and the transverse slot z'. The spring in of the auxiliary tumbler is not under load when the bolt is in the retracted position. A pin Z of the auxiliary tumbler engages in a slot in a two-armed lever m, which is pivoted on the lock casing and to the other arm of which the springs f of the tumblers e are operatively connected.

Two keyholes a and n" are provided, one

in the front and one in the back of the lock casing.

This mechanism acts in the following manner:

With the bolt a in the retracted. position as shown in Fig. l the springs and 7c exert no pressure on the tumblers 0 nor on the auxiliary tumbler g. The bolt is secured in its position by the bolt pin 0 lying in the transverse slot 2' of the auxiliary tumbler g. If the key be inserted for instance from one side of the casing through the keyhole n and turned, first of all the auxiliary tumbler y will be turned into the position shown in Figure 2, the double lever on being at the Same time swung to the right, thus causing the tumblers c to come into the position that will allow of the subsequent movement of the bolt, namely with the bolt pin 0 lying in the longitudinal slot it of the auxiliary tumbler g, whereupon the movement and locking of the bolt. pin is effected in the ordinary manner by the teeth p of the tum blers which are spring loaded, hen the bolt has in this way reached its extreme pro boltthe rkey must be introduced into the .same keyhole m as that used for projecting the bolt.

jeeted positiony-it' can only-bereturnedto its "retracted position shown in Fig. l by the lock being operated from the same side of the casing, as the-key,- it introduced into the keyhole n on the other side of the easing is not capable of turning the auxiliary tumbler g, as the latter is secured from turning about. the .pin aby. the bolt spin 0, which is in its longitudinal slot h and locked by theitumblers e. Henoeto-r retraoting the Tlieop'erationis similar {if the bolt at has been displaced by using the 'keyhol'e a, 1F ig. 3. In -this ease the double lever-m is sw'ung to' 'the left Fig; -3),'the=b olt 'pin- 0 i slides in'the '=longitudinal parts '71 of the :slot in the auxiliary tumbler gand is locked by the teeth p of the tumblers e;

' T-he tumblers e and the V slot-of the {auxiliary tumbler 9 :may be combined in a isingf-lei' part 9, as'shownin Fig. 8.

l Vhat olaini is 1." A loekzliaving' acasing having keyholes the bolt in 'retraeted position and capable of beingswung iaside by the l ey (luring its bolt projecting movement, when the latter is inserted in either of the two keyholes to permit the bolt 'to'be slid-forward,-a spring 1 -lor holdingthe auxiliary tumbler in normal intermediate position; all the tumblers being movable to an intermediate bolt releasing position and being arranged relatively to their corresponding springs in such a manner that, when the tumblers are in their intermediate positions, they are not acted :upon by the springs, and means provided 011 all the tumblers adapted to engage with the bolt pin to look the bolt in -projected position, said bolt pin ooactingwith *the auxiliary tumbler to maintain the latter insuch position, when the bolt-is projected,

:as to prevent movement of the tumblers-to bolt releasing position by-a key insertedin any keyhole except the one u-sed-for-pro- 'jecting' the bolt.

- 2.'-'-In a -lo'ck'as elaimedin' Claim "L the provision of U shaped slot in tlieaux i liary 5 tumbler for the purpose of holding the bolt pin-in the transverse part-o'f the U,Wl1E11 I thei loek is open, so that'a movement 'efithe *bolt can only take plaee'after theauxiliary tumbler has been swung-aside,as-set' liorth.

3. A lock as claimed in clai1n-1, --hay-i ng a I lever with two arms; aslot in one arm thereof, a pin on the auxiliary tumbler 'for- 'engaging inthe said slot and meansiby'which the lever is pivoted in the casing the springs of all the tumblers with the exceptioiiot the auxiliary tumbler being arranged so as to engage the-other-arinof the lever' in suoh a-mann'e'r that,- on the-auxiliary tumbler being turned in either dire'etion, the tumblers become spring pressed so as to operate in either direction, as set forth.

In testimony whereof I havesigned my name to this specification.

' DR. JULIUS KONIG. 

